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Enjoy your tunes and never miss a call with Sennheiser's MM 100 Bluetooth stereo headset. Its convenient wireless design lets you take calls, hold crystal-clear conversations, and hear your music with rich, high-fidelity sound  all from your multimedia-capable mobile phone. The lightweight, neckband design stays securely in place when you're on the go, and provides excellent long-term wearing comfort.

Enjoy your tunes and never miss a call with Sennheiser's MM 100 Bluetooth stereo headset. Its convenient wireless design lets you take calls, hold crystal-clear conversations, and hear your music with rich, high-fidelity sound  all from your multimedia-capable mobile phone. The lightweight, neckband design stays securely in place when you're on the go, and provides excellent long-term wearing comfort.

The MM 100's open-back earpad construction gives your tunes added acoustic depth and detail while allowing you to hear what's going on around you  a big plus on busy city streets. Convenient controls on the earcup let you adjust volume, skip tracks forward or back in a playlist, and answer or end calls on compatible Bluetooth devices, all without ever having to take your phone out of your pocket. Sennheiser supplies a handy USB charging cable plus a wall charger in the box for keeping your 'phones powered up and ready to go.

This thing is awesome! I could hear the music on my iPod touch® perfectly, nearly blocking out the more annoying people around me when I turned them up loud enough. This headset is very comfortable. It's light and the band is kind of thin and fit just behind my head. The sound quality was great."

Not enough advantages to go wireless

I'm comparing this model to a wired Sennheiser model with a microphone for voice calls. There's not a lot of reason to go wireless. The wireless model has good sound quality, but the volume is a lot lower than the wired model. They're nice when out on a walk. I found they aren't loud enough on a crowded commuter train, or any place noisy. They aren't the best choice for a workout either. They become drenched with sweat really easy, and the manual states to keep them away from liquids. I probably wouldn't purchase them again if I had a good set of wired headphones. If you have to have wireless open air headphones, these will satisfy most of your needs.

Fair headset, but not worth the price.

I purchased this and the Motorola MOTOROKR S306 at the same time.
Overview of the benefits over the other.
The Sennheiser was more comfortable, cut out less, had better sound quality, better build quality, and had replaceable earfoams. The MOTOROKR was a third of the price, used a micro-usb charging cable, did not have the annoying beep when placed on mute, and did not make me look like Mickey Mouse when wearing it.
Due to the charging cable issue, I got rid of the Sennheiser MM 100 and use the MOTOROKR on a daily basis.

Would not recommend

The MM-100 is one of the better BT headphones out there, but it's not perfect. Ive owned it since Feb 2012. This headset connects easily across multiple devices with no trouble. The construction appears weak, but you want something light on your head if you're wearing it for hours. I listen to a wide range of music. Hip Hop, Dance, Rock, etc., sounds great with moderate bass and dynamic sound. The deal breaker for me is when I play meditation, nature, or more quiet music such as a solo piano; I can hear some sort of electronic noise feedback in the right ear. The noise stops after 3 seconds from being unpaired from the device. I've paired with the Iphone4, Ipad2, 3 other cell phones, and Win7 PC all resulting in the same issue. I've tried using it in different locations- it still had that faint clicking sound. I have used a different brand of headphones for years and will continue to use it until someone can top it. One other annoyance factor is you have to use the charging cable that comes with the MM-100. A micro-USB charging cable would be nice.

Controls: On the right ear-cup there are integrated controls
for your connected phone or audio device. Audio controls include volume, skip
forward or backward, pause, and play. Phone controls include volume, accept call,
reject call, end call, redial, voice dial, and mute.

Note: All control functions must also
be supported by the connected device. The 2nd generation
iPod touch, iPhone 3G, and iPhone 3GS support only the
play and pause audio functions via AVRCP.

Battery Pack: The MM 100 has a built-in Lithium-Polymer
battery pack which provides up to 7-1/2 hours of music
playback or up to 9 hours talk time (phone). An AC adapter is included to
charge the battery pack; charging time is approximately 2-1/2 hours. The
headphones can also be charged using a computer's USB port.

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